Percentage elongation calibrated digital pulse deleter

ABSTRACT

A digital pulse deleter for use with digital control systems of electric motors driving work stand rolls in processing lines to afford selective adjustment of motor speeds calibrated in terms of percentages of elongation between successive work stands. The deleter can be adjusted by readily made changes in electrical interconnections to be determinative of what percentage of input pulses will and what percentage of such pulses will not be subject to deletion by selector switches. Operation of the selector switch permits selection of the increments of pulses subject to deletion that will be actually deleted with such increments being calibrated as a percentage or a per unit value of elongation or draw. The percentage of total deleter input pulses not subject to deletion is determinative of the maximum elongation or draw ratio to which the deleter will be so calibrated.

United States Patent Greening et al.

541 PERCENTAGE ELONGATION CALIBRATED DIGITAL PULSE DELETER [72]Inventors: Donald J. Greening, Theinsville; Paul M. Kintner, Bayside;Sanford M. Strand,

West Allis, all of Wis. [73] Assignee: Cutter-Hammer, Inc., Milwaukee,Wis. [22] Filed: Oct. 22, 1969 [21] Appl. No.: 868,305

[56] References Cited UNITED STATES PATENTS I 3,404,343 10/1968 Strand..328/42 0 5 scum COUNTER 1 DEZADf [is]- 3,655,950 1 Apr.ll, 1972Primary Examiner-Eugene G. Botz Attorney-Hugh R. Rather ABSTRACT Adigital pulse deleter for use with digital control systems of electricmotors driving work stand rolls in processing lines to afford selectiveadjustment of motor speeds calibrated in terms of percentages ofelongation between successive work stands. The deleter can be adjustedby readily made changes in electrical interconnections to bedeterminative of what percentage of input pulses will and whatpercentage of such pulses will not be subject to deletion by selectorswitches. Operation of the selector switch permits selection of theincrements of pulses subject to deletion that will be actually deletedwith such increments being calibrated as a percentage or a per unitvalue of elongation or draw. The percentage of total deleter inputpulses not subject to deletion is determinative of the maximumelongation or draw ratio to which the deleter will be so calibrated.

7 Claims, 9 Drawing Figures 5 ELEC T01 SWITCHES PULSE SCALER PERCENTAGEELONGATION CALIBRATED DIGITAL PULSE DELETER BACKGROUND OF THE INVENTIONprovide, or accommodate, the elongating material. In some instances, dueto controlled application of heat, the material may shrink betweensuccessive work stands providing shrink or negative elongation.

The frequency based digital motor control systems of the typedisclosedin the Strandet al. U.S.Pat. No. 3,331,006 have proved very desirable incontrolling the drive motors for work roll stands in such materialprocessing lines because the speed ratios of the motors can be set bymeans of digital switches and held to zero average error over any periodof time. A single master frequency speed reference can be used and speedratios at successive work stands may then be provided by deletion ofpulses in proportion to the change in speed ratio desired betweensuccessive work stands.

As understood in the aforementioned material processing industries,elongation of material between any successive work stands is defined asthe ratio:

E Elongation L, Per Unit Length at Input of Initial Stand 1.0)

L Per Unit Length at Output of Final Stand (1.0 Stretch)/l It will beobserved that for stretch or positive elongation E will be positive, andfor shrink or negative elongation, E will be negative.

Providing reference motor speed settings for the work stand drivingmotors calibrated in terms of per unit or percentage elongation would bea considerable and meaningful convenience to such material processingindustries. As far as is known, speed regulation devices of the digitalpulse type have not heretofore been so calibrated.

OBJECTS OF THE INVENTION It is a primary object of the present inventionto provide a novel formof digital pulse deleter affording pulse deletionincrements calibrated as per unit or percentage elongation.

Another object of the invention is to provide a pulse deleter designwhich can be adapted to provide any practical increments of elongationcalibration.

A still further object is to provide a pulse deleter of theaforementioned kind which can be adapted to a number of differentmaximum draw ratios between work stands by simple changes in certainelectrical interconnections.

Other objects and advantages of the invention will hereinafter appear.

SUMMARY OF THE INVENTION The pulse deleters of the present invention aredesigned to provide per unit or percentage adjustments of elongation inutilizes binary coded decimal counter modules and pulserscaler moduleslike that disclosed in Strand U.S. Pat. No. 3,404,343.

A basic form of the deleter uses two input cascaded binary coded decimalcounter decades which have a plurality of count output tenninalsconnected to respective input terminals of an intermediate stagepulser-scaler, and at least one output terminal connected directly to aninput terminal of a final stage pulser-scaler. The output of theintermediate stage pulser-scaler is connected to the input of threecascaded binary coded decimal counter decades for0.l percent resolu-.THE DRAWINGS The accompanying "drawings illustrate preferredembodiments of the invention which will now be described in detail, itbeing understood "that the embodiments illustrated are susceptible ofmodifications in respect of details without departing from the scope ofthe invention.

FIG. I is a diagrammatic showing of a material processing line havingelectric driving motor control systems incorporating the invention.

FIG. 2 "is a block diagram of a pulse deleter incorporating theinvention. I

FIGS. 3a to 30 are tables depicting the schedules of operation forselector switches in the deleter of FIG. 2.

FIG. 4 is a block diagram of a portion of a deleter like that shown inFIG. 2 showing another preferred form for pulse deleting selectorswitches.

FIG. 5 is a table showing the relationship between certain selectableterminal connections for the deleters of FIGS. 2 and 4 and calibratedelongation or draw ranges afforded.

FIG. 6 is a front view of a preferred rotary selector switch withdigital indicating means useable in the deleter of FIG. 4, and

FIG. 7 is a fragmentary view in side elevation of the switch of FIG. 6.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 depicts a processingline comprising a plurality of pairs of coupled workrolls 10-12, 14-16,18-20, 22-24 and 26-28 which may be assumed to progressively effectelongation of a continuous length of material 8. The pairs of work rollsfrom left to right are connected to gear boxes 30, 32, 34, 36 and 38which are in turn each connected for driving by individual DC motors 40ato 40e.

Each of the motors may assumed to be connected for energization to motorpower supplies 42a to 42e, which are each respectivelycontrolled by likedigital motor control systems 44a to -44e. It may be assumed that eachpair of the motor power supplies and digital motor control systems arelike that disclosed in the Strand et al. U.S. Pat. No. 3,331,006 and inthe Strand U.S. Pat. No. 3,349,308 to which reference should be made fora complete and detailed understanding.

The motors 40a to 40c drive digital tachometers or pulse generators 46ato 46c respectively. Pulse generator 46a is connected to feed outputpulses to a pulse deleter 4811 which in turn is connected to feed outputpulses to digital motor output system 44a as a feedback signal. Pulsegenerator 46b feeds output pulses to a pulse deleter 48b, which in turnsupplies output pulses to motor control system 440 as a reference signaland 44b as a feedback signal. A master or base reference'digitaloscillator 50supplies output pulses to digital motor control systems 44band 440 as reference signals and to pulse deleter 48d. Pulse tachometergenerators 46c, 46d and 46e feed their respective output pulses directlyto their associated digital motor control systems 44c, 44d and Me asfeedback signals. Adjustable pulse deleter 48d is connected to supplyoutput pulses to digital motor control system 44d and to a pulse deleter48d which is connected to supply its output pulses to digital motorcontrol systems 44c.

The number of draw units, either upstream or downstream from the masterspeed unit (400) can be extended as required for any particularapplication. Additional upstream units will have the same connectionrelationship to the last upstream unit as 44a, 46a and 48a have to 44b,46b and 48b. Additional downstream units will have vthe same connectionrelationship to the last downstream unit as 44c and 48e have to 44d and48d.

Assuming equal roll diameters for all units, gear box 34 may be assumedto provide a l to 1 speed ratio between motor 40c and the coupledrollers 18 and 20. Gear boxes 36 and 38 may be assumed to provide a stepup speed ratio of K to l and L to 1 respectively between motors 40d and40e and their respective pairs of coupled rollers 22-24 and 26-28. Theletters K and L represent numerical values where: L K l. Gear boxes 30and 32 may be assumed to provide step down speed ratios relative to thatof gear box 34 and that they have ratios l to H and l to J. The lettersH and .l represent numerical l) values where: 1 1 H. Accordingly, thefollowing relationship of gear ratios holds true for the gear boxes 30to 38.

When the motors 40a to 40e are running at the same speed then, due tothe aforementioned gear ratios, the material 8 will progressively bepulled faster between each pair of rolls in a ratio equal to step up ingear ratios between any adjacent pairs of coupled work rolls. If thematerial 8 is stretchable, the amount of stretch or elongation betweenany successive pairs of coupled work rolls will then be a positivemaximum and a direct function of the difference in gear ratios.

it will be observed that due to the input of pulse deleter 48e beingconnected to the output of deleter 48d, that the former can either feedthe same number of pulses per unittime occurring at the output of thelatter, or some lesser number during the same time to the referenceinput of motor controller 44e depending upon the deletion adjustment ofthe former. Thus, if deleter 48d is set for zero pulse deletions, motors40d and 40e will run at the same speed, and elongation of the material 8will be the maximum possible in the ratio of UK. Now considering thecoupled roll pairs 14-16 and 18-20 it will be seen that if theirrespective driving motors 40b and 400 operate at the same speed that themaximum elongation possible between these coupled roll pairs will bein-directed proportion to the gear rates in the gear boxes 32 and 34 or(l-J/J). With motors40a and 40b running at equal speed the maximumelongation of the material 8 between coupled rolls 10-12 and 14-16 willbe in the ratio of (J-H/H) and will occur if pulse deleter 48a is set todelete zero pulses per unit time fed into it from tachometer generator46a.

When pulse deleters of the type now to be described in conjunction withF lG. 2 areused for the deleters 48a to 48 in the system of FIG. 1 thenspeed changes effected by settings of their selector switch will providemotors speed changes which .may be calibrated in terms of percentages ofelongation. As ,hereinbefore indicated, maximum elongation betweenadjacent roll stands occurs when their driving motors run to provideequal number of pulses per unit of time. As will hereinafter'beapparent, selective operation of the switches A1 to A4, B1 to B4 and C1to C4 permits changes in increments of 0. l percent of maximum drawrange.

As shown in FIG. 2, the preferred form for each of the pulse deleters48a to 480 comprises a first digital pulse counter decade 54 having ainput pulse terminal 54a and five count output terminals 54b to 54f.Count output terminal 54b is directly connected to the input terminal56a of a pulser-scaler 56 which has additional input terminals 56b to56n and a single pulse output terminal 56p. The other count outputterminals 540 to 54s of counter 54 are connected to input terminals 58ato 58c of a second pulser-scaler 58 which has a single pulse outputterminal 58d.

Output terminal 54f of decade 54-connected to input terminal 60a of asecond decade counter which has five count output terminals 60b to 60f.Count output terminals 60b to 60f are connected to input terminals 58cto 58i of pulser-scaler 58 respectively. 4

The pulse output terminal 58d of pulser-scaler 58 is connected to inputterminal 62a of a third digital pulse counter 62 like counters 54 and 60and has five count output terminals 62b to 62f. Count output terminals62b to 62e are connected in series with selector switches A1 to A4respectively of a switch unit A to input terminals 56b to 56a ofpulser-scaler 56, and output tenninal 62f is connected to input terminal64a of a fourth digital counter decade 64 like decades 54, 60 and 62.

Counter 64 has four count output terminals 64b to 64? connected inseries with selector switches B1 to B4 respectively of a switch unit Bto input terminals 56f to 561' of pulser-scaler 56. The fifthcountoutput terminal 64f of counter 64 is connected to input terminal66a of a fifth digital counter decade 66.

Counter 66 has four count output terminals 66b to 66e connected inseries with selector switches C1 to C4 of a switch unit C to inputterminals 56j to 56m'of pulser-scaler 56. The fifth count output 64f isconnected in series with a knife switch 68 to input terminal 56n ofpulser-scaler 56.

The counter decades 54, 60, 62, 64 and 66 may be assumed to be designedand internally connected to provide count signals at their respectiveoutput terminals in'binaryv coded decimal mode for each series of 10input pulses. Pulser sealers 56 and 58 are preferable of the circuitconfiguration disclosed in the Strand US. Pat. No. 3,404,343 and providea pulse of desired shape and duration at their output terminals 56;; and58d for each count pulse impressed at one of their input terminals.

Now referring again to FIG. 1, -let it be assumed that all of the workstand rolls are of equal diameter, and that gear box 36 has a step upspeed ratio of 2 to 1 when gear box 34 has a unity speed ratio. If thedeleter shown in FIG. 2 is used for deleter 48d, then a draw range of0.1 to 100 percent will exist between work stand roll sets 18-20 and22-24. 100 percent draw, or stretch of the material will occur whenmotors 40c and 40d are running at equal speeds. Equal speeds will ofcourse occur when 460 and 46d are producing equal number of pulses perunit of time and all of the switches in switch units A, B and C of FIG.2 are closed, and the same number of pulses are produced at outputterminal 56p of the deleter as fed in at inputterminal 54a.

I With counter decade 54 internally connected to provide count outputpulses in a binary coded decimal mode, it will be seen that the scalingweights at terminals 54b to 54f of counter decade 54 per 1,000 pulses atterminal 54a and at terminals 62b to 62f of counter decade 62 per 1,000pulses at terminal 62a will be 500, 200, 100, 100 and 100. The scalingweights for the same number of input pulsesat terminal 62a will be 50,20, l0, l0 and 10 at the terminals 64b to 64f of counter decade 64 andwill be 5, 2, 2, l and l at terminal 66b to 66f of counter decade 66. Asterminal 54b is directly connected to input terminal 56a of pulserscaler 56 and terminal 66f is also directly connected to terminal 56n, aminimum of 501.pulses out of each 1,000 generated by oscillator 50 willbe fed to digital motor control module 44d. This determines the minimumspeed at which motor 40d can run. As will hereinafter be more fullyexplainedsuch minimum speed provides a draw of 0.1 percent of maximumbetween work stand rolls 18-20 and 22-24.

Hereinbefore, the term elongation (E) was referred to in a formula interms of initial per unit length (L,) and final per unit length (L Itcan also be demonstrated that elongation (E) can be expressed as:

Where:

This can be rewritten'as:

and

P number of pulses from elongation roll X linear roll surfaceper pulseof elongation roll Pl=number of pulses l'rominitialroll X, linear rollsurface per pulse of initial roll Under these conditions, if P P, atmaximum elongation, then (X )/(X,) 1 Maximum Elongation. This can beaccomplished by proper gearing of the motors to rolls, and of pulse tachgenerators to the motors.

. Now with the deleter 48d of the form shown in FIG. 2 if a maximum drawof 2 to l is desired, then P, P at maximum, elongation, and X 2X,. Inother words linear roll surface travel per pulse of the elongation rollis two times the roll surface travel per pulse of the initial roll.

It will be noted that as only.50 percent of the pulses fed in at inputterminal 54a of the deleter can be deleted, deletion of one pulse indeleter 48c will be 1/500 of each '1 ,000 input pulses, or 1/1000 ofeach 2,000 input pulses. Based on a cycle of 2,000 input pulses, 2 feetper output pulse represents 2/2000 or 0.1 percent speed difference interms of resulting elongation E.

The tables of FIGS. 3a to 3c depict the required pattern of closure ofthe switches of switch units, A, B and C for any desired percentage ofelongation desired between 0.1 percent and 100 percent of maximumpossible draw. The indication X" below any switch column designatesclosed condition of the switch at the top of the column while 0 in thesame space indicates open condition of that switch. For example, if anelongation of 65.3 percent is desired for the arrangement set up for 100percent maximum elongation outlined above, this would require deletionof I00-65.3 34.8 percent. This would require closure of switches A1, A3,B1 and C3 of FIGS. 30, 3b and 3a respectively.

It will be appreciated that the pulse deletion of FIG. 2 can also beused for any of the deleters 48a to 484' in the material processingdrive control system of FIG. I. In the case of deleters 48a and 48b,settings of switch units A, B and C to provide a lesser number ofpulsesthan base oscillator 50, or a preceding pulse deleter, and will causethe digital motor control unit 44a or 44d to run at a proportionallyfaster speed and therebyreduce the elongation of the material betweeneither work stand rolls -12 and 14-16 and 18-20 as the case may be. Thepercentage of elongation will depend upon the pattern of closure of theswitches of switch units A, B and C hereinbefore discussed.

FIG. 4 shows a portion of the deleterof FIG. 2 together with anotherform for switch .units A, B and C inclusive of a coordinating operatingmechanism required to provide direct reading elongation calibration.More particularly each of the switch units A, B and C have switch decksAl to A4, B1 to B4 and CI to C4. Cooperating rotary contactors AC1 toAC4, BC! to BC4 and CCl to CC4 which are fixed to rotary operatingshafts, AS, BS and CS. Each of the switch decks has ten stationarycontacts spaced at equal rotary angles of 36. The stationary contacts onthe respective decks are interconnected with the input terminal 56b to56m of pulser scaler 56 as shown.

Operating shafts AS, BS and CS are connected internally in a Geneva orOdometer type of gear mechanism 70. It may be assumed that by manualturning of a crank 72 fixed on an input shaft to gear box 70 that thelatter provides operation of shafts AS, BS and CS in coordinate turnsratio. For every revolution of shaft CS it may be assumed that shaft BSis indexed one-tenth of a revolution. For every complete revolution ofshaft BS shaft AS is indexed one-tenth revolution. Thus by appropriateoperation of crank 72 any of the combinations set forth in the tables ofFIGS. 3a to 3c between 0.1 percent and 100 percent elongation can beobtained, in step increments of 0.1 percent. As will hereinafter beexplained in connection with FIGS. 6 and 7, this fonn for the selectorswitches A, B and C permits use of digital indication which readsnumerically directly in terms of percentage of elongation.

While the deleters of FIGS. 2 and 4 will provide adjustment of draw orelongation between 0.1 percent and percent in increments of 0.1 percentwhen the draw range is 2 to 1 (100 percent stretch) with equal relativemotor speeds of adjacent work stands, it can be used with other drawranges as well. FIG. 6 shows how the preferred deleter of FIG. 2 can bereadily changed to be adapted to other draw ranges. For example. if thematerial between work stand rolls 18-20 and 22-24 is to be elongated amaximum of 25 percent, then gear box 36 would be selected to provide astep up speed ratio of 1.25 to 1 and each pulse from 46d will represent1.25 times the length of material or linear roller surface travel of thelength per pulse of 46c. Then as shown in the middle column, second rowfrom the bottom in FIG. 5 terminal 54c would be connected directly toterminal 56a of pulser scaler 56 and 54b would be connected to terminal580 of pulser scaler 58. Accordingly 20 percent of all pulses at inputterminal 54a would pass directly to pulser-scaler 56 and appear asoutput pulses at output terminal 56p. Thus for every input pulses atinput terminal 54a, 25 would appear at input terminal 56a and 100 atinput terminal 62a of decade 62. 1

i Now it will be observed that if switch units A andB are set to provide25 percent deletion (125-25 pulses) that 75 pulses out of every 100appearing at input terminal 62a will appear as input pulses at the inputterminals of pulser scaler 56, plus 25 pulses from 54c to input terminal56a. Thus, a total of 100 pulses will appear at output terminal 56p, forevery 125 input pulses at terminal 54a. Under such setting of switchunits A, B and C it will be seen that no stretch will occur between workstand rolls 18-20 and 22-24, since the relative speed of the elongationroll is 100/125, and the length per pulse is 1.25 times the initial rollpulses. 100/ 125 X 1.25 1.0 Zero elongation.

It will also be appreciated that for draw settings of switch units A, Band C less than 25 percent deletion that motor 40d will operate atrelative speeds affording a shrink" condition of the material. Incertain processing of materials controlled heating of the same willcause shrinkage and the work roll stands 22-40 for example would thenhave to run atsuch relative speeds as to accornodate the materialshrinkage. With all switches of units A, B and C open, motor 40d willdrive rolls 22-24 at a relative speed to provide exactly 74.9 percentnegative (shrinkage).

FIG. 5 shows how other draw or elongation ranges can be obtained byappropriate connection of various count output terminals of decades 54and 60 directly to input terminal 56a of pulser sealer 56. This tableholds true for counter decades connected for binary coded decimal countoutputs only.

Those skilled in the art will recognize that the deleter of FIG. 2 canbe readily modified to provide either coarser or finer increments ofpulse deletions. If pulse deletions affording elongation incrementalchanges of 1 percent will suffice then counter decade 66 and switch unitC can be eliminated. On the other hand if a finer incremental change,say 0.01 percent is desired then an additional counter decade and fourswitch selector switch units can be interposed between count outputterminal 66f of decade 66 and input terminals of pulser-sealer 56.

It will also be apparent that the deleter of FIG. 2 can also be modifiedto be calibrated to maximum draw or elongation ranges intermediate thosespecified in the right hand column of the table of FIG. 5. Suchmodification consists of connecting one or another of. the count outputterminals 62b, 62c and 62e directly to their respective associated inputterminals 56b, 56c and 56e of pulser-scalcr 56 without the interpositionof switch A1, A2 and A4 therebetween as the case might be.

A commercially available form of selector switch known as the SeriesRS-G Rotary Selector Switch, manufactured by the Precision ProductsDivision of the Chicago Dynamics Industries, Inc., Chicago, Illinois isideally suited for use in the pulse deletion system of FIG. 4. Suchrotary selector switch is shown and described in the Koci U.S. Pat. No.3,132,217 assigned to that Company. It provides the coordinatedoperation between switch units A, B & C in the manner hereinbeforedescribed in conjunction with FIG. 4, and in addition has a decimaldigit indicating dial.

FIGS. 6 and 7 show the outer fonn of a rotary selector switchconstructed in accordance with the Koci patent. It comprises anenclosure 80 in which is housed the switch decks, rotary contactors,rotary operating shaft, and Geneva mechanism similar to that describedin conjunction with FIG. 4. It is also provided with a knob 82 which hasincorporated therein a digital indicating mechanism 84 of a well knowntype. For use with the pulse deleting system of FIGS. 4, each of thedigit wheels 84a, 84b and 84c preferably has two numerals, with the lefthand numeral being black, and the right handnumeral being red or someother contrasting color. If the periphery of each digit wheel were laidflat the pattern of black and red numerals would be as follows:

Black Red 9 8 I 7 2 6 3 The left hand most indicating wheel 84 wouldhave a black in one indicating position in lieu of 0 and a red in theindicating position immediately adjacent thereto in lieu of 9. The blacknumbers then proceed in the normal numerical direction (1, 2, 3, etc.)indicating the decade unit of positive elongation. The red numbers thenproceed in the reverse numerical direction (I for 8, 2 for 7, 3 for 6,etc.) indicating negative elongation or shrinkage.

With thepreferred marking of the digit indicating wheels as abovediscussed in conjunction with FIG. 6, the rotary selector switch can bereadily calibrated to any of the draw ranges set forth in.the table ofFIG. 5 or other selected elongation ranges. For example, if theelongation or draw range is-to be +25 percent to 74.9 percent and switch68 is closed, then the selector switch is operated to a limit where allswitch units are closed. The dial mechanism 84 is then declutched fromknob 82 and then set so that the black numerals indicate +25.0, and thenre-clutched to move its digit wheels in synchronism with rotation of theknob 82. Then as the knob 82 is rotated to turn the switch operatingshaft to the other limit wherein all switch units are open, the digitwheel 84a would change 0.1 for each 36 of knob rotation, assuming a 1:1ratio between the knob and switch operating shaft. When knob 82 reachesthe last mentioned limit of rotation, the digit wheels would then have ared indication of 74.9 percent.

It is required that switch 68 be open if the selector switch is to givecorrect numerical indications in the negative draw range. If the drawrange is between 100 percent and 0.1 per-- cent and switch 68 is closedthe dial reading will be correct, but if open it will be 0.1 percentlow. In other words, under the last mentioned condition with all switchunits in the selector switch closed the dial indicating wheels will read+99.9 percent when no pulses are deleted.

We claim:

l. A digital pulse deleter comprising:

a. means for registering each of a continuous series of input pulses,

b. means directly connected to the first mentioned means and providingoutput pulses corresponding to a predetermined percentage of inputpulses registered in said first mentioned means, and

c. means connected between said first mentioned and the second mentionedmeans for selecting the number of the remaining percentage of inputpulses registered in said first mentioned means that are effective toalso provide output pulses at said second mentioned means.

2. The pulse deleter defined by claim 1 wherein the direct connectionbetween the first mentioned means and the second mentioned means can beselected to provide one or more of a plurality of predeterminedpercentages of said input pulse.

3. A digital pulse deleter comprising:

a. a binary coded decimal counter having a pulse input terminal and aplurality of count output terminals,

b. a pulser-sealer having a pulse output terminal and a plurality ofpulse input terminals with at least one thereof, being connected to acount output terminal of said counter,

c. a second pulser-sealer having a pulse output terminal and a pluralityof input terminals connecting respectively to the other output terminalsof said counter,

d. a second binary coded decimal counter having an input terminalconnected to the output terminal of said second pulser-sealer, andhaving a plurality of count output terminals, and

e. selector switch means interposed between output terminals of saidsecond counter and other input terminals of the first mentionedpulser-scaler.

4. A pulse deleter for use as a speed reference pulse signal source indigital control systems for electric motors driving work stands or thelike in material processing line comprising:

a. A pulse counter having an input terminal and a plurality of countoutput terminals,

b. a pulser-scaler having a plurality of input terminals which are allconnected to respective ones of some of the count output terminals ofsaid pulse counter and having a single output terminal which delivers apulse of given duration and amplitude for each voltage change of a givendirection and magnitude impressed at any of its input terminals,

c. a second pulse counter having its input terminal connected to theoutput terminal of said pulser and having a plurality of count outputterminals,

d. a second pulser-sealer like the first mentioned pulser which has atleast one of its input terminals connected directly to one of the otherof the count output terminals of the first mentioned pulse counter,

e. and means including individual switch elements connected between someof the output terminals of said second pulse counter and said secondpulser-sealer input terminals, said second pulser-sealer providing anoutput pulse for each input pulse at said one of its input terminals andaccording to selected closure of said individual switch elementsproviding additional output pulses for each input pulse to each inputterminal that is effective to receive pulses from said second pulsecounter.

5. A pulse deleter in accordance with claim 4 wherein said switch meanscomprises at least two multi-position, rotary operating shaft switchunits and a Geneva type gear mechanism between said operating shafts toprovide indexing of one shaft one rotary switch position each time theother shaft moves between two given switch positions in each revolutionof operation.

6. A pulse deleter in accordance with claim 5 wherein said switch meansincludes digital numerical indicating means which are settable at onelimit of operation of said switch means to provide a direct numericalindication of the percentage of material elongation afforded with nopulses deleted, and wherein said indicating means for each differentoperating position between said one limit and another opposite limitaffords numerical indications decimally calibrated in terms ofpercentage of material elongation corresponding to the number of pulsesthat are deleted in any of such switch operating positions.

7. The pulse deleter defined in claim 1 wherein said first mentionedmeans is so connected directly with said second mentioned means that thelatter provides output pulses equal in number to 50 percent of the inputpulses to said first mentioned means, and wherein said means connectedbetween said first and second mentioned means affords selection of the

1. A digital pulse deleter comprising: a. means for registering each ofa continuous series of input pulses, b. means directly connected to thefirst mentioned means and providing output pulses corresponding to apredetermined percentage of input pulses registered in said firstmentioned means, and c. means connected between said first mentioned andthe second mentioned means for selecting the number of the remainingpercentage of input pulses registered in said first mentioned means thatare effective to also provide output pulses at said second mentionedmeans.
 2. The pulse deleter defined by claim 1 wherein the directconnection between the first mentioned means and the second mentionedmeans can be selected to provide one or more of a plurality ofpredetermined percentages of said input pulse.
 3. A digital pulsedeleter comprising: a. a binary coded decimal counter having a pulseinput terminal and a plurality of count output terminals, b. apulser-scaler having a pulse output terminal and a plurality of pulseinput terminals with at least one thereof, being connected to a countoutput terminal of said counter, c. a second pulser-scaler having apulse output terminal and a plurality of input terminals connectingrespectively to the other output terminals of said counter, d. a secondbinary coded decimal counter having an input terminal connected to theoutput terminal of said second pulser-scaler, and having a plurality ofcount output terminals, and e. selector switch means interposed betweenoutput terminals of said second counter and other input terminals of thefirst menTioned pulser-scaler.
 4. A pulse deleter for use as a speedreference pulse signal source in digital control systems for electricmotors driving work stands or the like in material processing linecomprising: a. A pulse counter having an input terminal and a pluralityof count output terminals, b. a pulser-scaler having a plurality ofinput terminals which are all connected to respective ones of some ofthe count output terminals of said pulse counter and having a singleoutput terminal which delivers a pulse of given duration and amplitudefor each voltage change of a given direction and magnitude impressed atany of its input terminals, c. a second pulse counter having its inputterminal connected to the output terminal of said pulser and having aplurality of count output terminals, d. a second pulser-scaler like thefirst mentioned pulser which has at least one of its input terminalsconnected directly to one of the other of the count output terminals ofthe first mentioned pulse counter, e. and means including individualswitch elements connected between some of the output terminals of saidsecond pulse counter and said second pulser-scaler input terminals, saidsecond pulser-scaler providing an output pulse for each input pulse atsaid one of its input terminals and according to selected closure ofsaid individual switch elements providing additional output pulses foreach input pulse to each input terminal that is effective to receivepulses from said second pulse counter.
 5. A pulse deleter in accordancewith claim 4 wherein said switch means comprises at least twomulti-position, rotary operating shaft switch units and a Geneva typegear mechanism between said operating shafts to provide indexing of oneshaft one rotary switch position each time the other shaft moves betweentwo given switch positions in each revolution of operation.
 6. A pulsedeleter in accordance with claim 5 wherein said switch means includesdigital numerical indicating means which are settable at one limit ofoperation of said switch means to provide a direct numerical indicationof the percentage of material elongation afforded with no pulsesdeleted, and wherein said indicating means for each different operatingposition between said one limit and another opposite limit affordsnumerical indications decimally calibrated in terms of percentage ofmaterial elongation corresponding to the number of pulses that aredeleted in any of such switch operating positions.
 7. The pulse deleterdefined in claim 1 wherein said first mentioned means is so connecteddirectly with said second mentioned means that the latter providesoutput pulses equal in number to 50 percent of the input pulses to saidfirst mentioned means, and wherein said means connected between saidfirst and second mentioned means affords selection of the number of theremaining 50 percent of the input pulses to said first means that areeffective to provide output pulses at said second mentioned means.